---Someone is knocking at the door. Who may it be?---It ______ be Tom. He is still in the school.
Lei Feng is my hero. We should learn from him and think less of____ than others.
My mother is ill. I ______ stay at home to take care of her.
--- Don’t be late next time. --- ______________.
Nanjing isn’t so large____ Shanghai. But it's the second____ city in East China.
---Which month has _______ days in a year? ---February.